31.

Oxidation states of P in H₄P₂O_5, H₄P₂O₆, H₄P₂O₇, are respectively

• +3, +5, +4

• +5, +3, +4

• +5, +4,+3

• +5, +4,+3

The correct order of increasing bond angles in 

• Cl₂O < ClO₂ < ClO₂^-

• ClO₂ <Cl₂O< ClO₂^-

• Cl₂O < ClO₂^- < ClO₂

• Cl₂O < ClO₂^- < ClO₂

25.3 g of sodium carbonate, Na₂CO₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely molar concentration of sodium ion, Na⁺ and carbonate ion, CO₃^2- are respectively (Molar mass of Na₂CO₃ = 106 g mol^-1)

• 0.955 M and 1.910 M

• 1.910 M and 0.955 M 

• 1.90 M and 1.910 M 

• 1.90 M and 1.910 M 

The existence of two different coloured complexes with the composition of [Co(NH₃)₄Cl₂]⁺ is due to 

• linkage isomerism

• geometrical isomerism

• Coordination isomerism

• Coordination isomerism

During the kinetic study of the reaction, 2A + B --> C+ D,  following results were obtained 

• rate = k[A]²[B]

• rate = k [A][B]

• rate = k[A]²[B]²

• rate = k[A]²[B]²

Which one of the following species does not exist under normal conditions?

• (+)Sucrose

• (+)Lactose

• (+) Maltose

• (+) Maltose

Given are cyclohexanol (I), acetic acid (II), 2,4,6-trinitropenol (III) and phenol (IV). In these, the order of decreasing acidic character will be

• III > II> IV> I

• II > III> I > IV

• II > III> IV> I 

• II > III> IV> I 

Which one of the following compounds has the most acidic nature? 

Which one is most reactive towards S_N1 reaction?

• C₆H₅CH(C₆H₅)Br

• C₆H₅CH(CH₃)Br

• C₆H₅C(CH₃)(C₆H₅)Br

• C₆H₅C(CH₃)(C₆H₅)Br

Which one of the following is employed asa tranquilizer drug?

• Promethazine

• Valium

• Naproxen

• Naproxen